Bauphal upazila on the north, Galachipa upazila on the south, Lalmohan and Charfasson upazilas on the east, Galachipa upazila on the west.

Dashmina thana was turned into an upazila in 1983. It consists of 6 union parishads, 51 mouzas and 55 villages.

Dashmina Upazila is located in Patuakhali District. Upazilla(s)/Thana(s) in Patuakhali are Bauphal Upazila, Dashmina Upazila, Galachipa Upazila, Kalapara Upazila, Mirzaganj Upazila, Patuakhali Sadar Upazila.